package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 发送验证码
     *
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1. 校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            // 2. 如果不符合，返回错误信息
            return Result.fail("手机号码格式错误");
        }

        // 3. 符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        // 4. 保存验证码到redis
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY + phone,code,RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);

        // 5. 发送验证码
        log.debug("发送短信验证码成功，验证码：{}",code);

        // 6. 返回ok
        return Result.ok();
    }

    /**
     * 登录功能
     *
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1. 校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            // 2. 如果不符合，返回错误信息
            return Result.fail("手机号码格式错误");
        }

        // 2. 校验验证码redis
        String cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();

        if (cacheCode == null || !cacheCode.equals(code)) {
            // 3. 如果不一致，报错
            return Result.fail("验证码错误");
        }

        // 4. 一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();

        // 5. 判断用户是否存在
        if (user == null) {
            user = createUserByPhone(phone);
        }

        // 6. 保存用户信息到redis
        // 生成一个token
        String token = UUID.randomUUID().toString(true);
        // 将user对象装换位哈希map对象
        UserDTO userDTO = BeanUtil.copyProperties(user,UserDTO.class);
        // Bean 转换为 Map: {username=Alice, age=25, email=alice@example.com}
        // 自定义，使得字段名变成String类型
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));

        // 存储
        String tokenKey = RedisConstants.LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        // 设置有效期
        stringRedisTemplate.expire(tokenKey,RedisConstants.LOGIN_USER_TTL,TimeUnit.MINUTES);
        // 返回taken 给客户端

        return Result.ok(token);
    }

    @Override
    public Result sign() {
        // 1. 获取当前登录用户
        Long userId = 1L;

        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();

        // 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        // 4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.写入Redis setbit key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth - 1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        // 1. 获取当前登录用户
        Long userId = 1L;
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        // 4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.获取本月截止今天为止的所有的签到记录，返回一个十进制的数字
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if(result == null || result.isEmpty()){
            return Result.ok(0);
        }
        // 6.循环遍历
        Long num = result.get(0);
        if(num == null || num == 0){
            return Result.ok(0);
        }

        int count = 0;
        while (true){
            if((num & 1) == 0){
                break;
            }else {
                count ++;
            }
            num >>>= 1;
        }

        return Result.ok(count);
    }

    private User createUserByPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
